The Chaos Femerald (Sonic the Hedgehog)

The Chaos Femerald (Sonic the Hedgehog)

A/N: The Chaos Femerald was a commissioned one shot originally written back in July of 2022 Posting it up here and now for people to enjoy!

Summary: On his way back from foiling Eggman yet again, Sonic comes across a bright pink Chaos Emerald. When he picks it up, everything changes.

Themes: Genderbending, Furry Sex, Rough Sex

-x-X-x-

Another day, another victory against Doctor Eggman's latest plot to take over the world. Having successfully stopped the mad scientist and his equally mad schemes, Sonic the Hedgehog was taking the scenic route on his way home... a victory lap, if you will. Specifically, he was traveling through the verdant Green Hill Zone, admiring the sights and enjoying what was effectively a leisurely stroll, compared to some of the things Robotnik had put him through THIS time around.

However, as Sonic is racing along at the speed of sound, something catches his attention. Sonic's large eyes were perfect for allowing him to catch sight of things, even when racing about at breakneck speeds. Well, breakneck for everyone else. For Sonic, it's nothing too special. Even still, he notes a glimpse of something shimmering pink, an out of place sigh in Green Hill.

Skidding to a halt, the hedgehog turns and zips back over to what he saw, his curiosity piqued. What Sonic finds, however, confounds him. There, just sitting in the grass out in the open like it's nothing special, is something absolutely identical to a Chaos Emerald.

Sonic should know. With Eggman utterly obsessed with the damn things, Sonic has lost track of just how many times he's been forced to tackle their retrieval, or recovery, or what have you. All in all, Chaos Emeralds are the bane of Sonic's existence, more often than not. However, this one is odd, given that it's a very, very vibrant pink color.

He's never seen anything like it before, but if there's one thing the hedgehog is absolutely sure of, it's how Eggman will react if he catches wind of it. If Sonic just ignores this and continues on his way, there's not a doubt in the speedster's mind that the next time he sees this weird pink Chaos Emerald, it'll be held aloft in one of Dr. Robotnik's gloved hands as the egg-shaped supervillain cackles evilly.

That said, Sonic barely hesitates to reach out and snatch the bright pink Chaos Emerald up. He figures he'll hand it off to Tails so that his fox ally can figure out what the hell it is and what they need to know about how to keep it out of Eggman's hands.

However, as soon as Sonic grabs it, the Chaos Emerald begins glowing brighter and brighter.

"What the-?!"

So fast, too fast for even Sonic to react to, it erupts in a burst of pink light that consumes not just the hedgehog holding it, but also the entire area. A powerful, odd, burning sensation courses through Sonic's body and he goes ramrod stiff. It's not painful or agonizing, but it's definitely intense, and it feels like every fiber of his being, every nerve in his form, is standing on end at once.

Before the light can even clear from his vision, before Sonic can even take stock of what's going on, the pressure and sensation gets to be too damn much, and his eyes roll back in his head as he passes out on the spot.

-x-X-x-

"Hey... hey! You okay? Sheesh, you probably need some water. Here, I've got a water bottle, take a sip."

As Sonic slowly comes back to consciousness, there's a hand supporting her head, and the open mouth of a water bottle pressing into her lips and slowly tipping forward. Eyes fluttering open, she quivers as she slowly comes to. The first thing Sonic notices is the guy kneeling beside her. A young human man, he gives her a hesitant but kind smile, even as he offers her his water bottle, no questions asked.

A sudden aggressive thirsty need fills the hedgehog, and as he tips the water bottle forward to get a sip, she opens wide and lets the clear, crystal liquid flow down the back of her throat. Swallowing, she finds that it doesn't quench her thirst as much as she thought. Rather... her thirst is a different sort of thirst entirely.

Sonic's tongue lolls out, and her lips suction around the opening of the water bottle, as she sucks and slurps away at the slightly phallic member. She drinks more and more of the water, one of her hands coming up to snatch the bottle for herself as she all but deep-throats it for a brief time. But it's not enough... no, rather, it's not the RIGHT sort of phallus.

Belatedly, Sonic notes that she's thinking of herself in female pronouns, and glances down at her body to confirm... yep, she's definitely a woman now. Her chest has expanded outward, not too much but certainly enough that she's got a pair of naked breasts each capped with a cute little pink nipple. Meanwhile, her waist has tightened up... or maybe it's stayed the same, and it's her hips that have ballooned outwards into a more feminine, hour-glass shape.

Meanwhile, down between her furry thighs she's got a pussy now, instead of a dick. And yet... Sonic doesn't find any of this the least bit strange. She remembers being a guy, but she feels completely at home being a girl now. Odd, to say the least.

But honestly, all of those observations ultimately take second fiddle to the heart of the matter, which is Sonic's raging, burning, all-consuming and immensely powerful lust. That's the true nature of the 'thirst' she's currently feeling, and as she finishes sucking every last drop of moisture out of the offered water bottle, Sonic turns her eyes towards the young man who'd 'saved' her.

He's watched her eyes move up and down her own body and watched her all but inhale his water bottle to get every last drop of liquid out of it. He blushes, as she looks to him with a hooded gaze.

"U-Um... sorry, I don't know what happened that you got left here on the side of the road naked and alone in a place like Green Hill... but I'm glad I was able to help?"

And for that, she would never be able to repay him. Giggling at her own inner thoughts, completely lust-drunk, Sonic can only moan as the young man finally reaches up and grabs her by her new tits.

Her breasts are on her somewhat hairless front, and thus not covered by blue fur like the rest of her. As such, her titties feel especially sensitive as his fingers grope and squeeze at her new fun bags. Of course, fun bags isn't quite right. Sonic's new female form can honestly be described entirely with one word, a word she'd used earlier. Svelte.

In turn, her breasts really aren't that big... as evidenced by how the human she's riding harder and faster by the moment can't even fully wrap his hands around them. Instead, he's bringing his fingers together in a claw machine sort of motion, and pinching her soft, small boobies as she bounces upon his cock.

To be fair, it still feels amazing... so amazing, in fact, that Sonic can't help but speed up. The only downside to this is, the harder and faster she fucks herself on his dick, the less control he can maintain until finally, his hands fall away from her tits altogether. Sonic is moving VERY fast now, and only her comparatively smaller nature keeps her from hurting her lover with her speed.

Indeed, as she turns into an almost blue blur while bouncing up and down on his throbbing phallus, the young man groans in audible enjoyment, his cock surging up inside of her and his balls churning with a fresh load. He's going to cum again, and soon, and there's no doubt in Sonic's mind exactly where that's going to be.

And why not, right? She already had his first delicious load filling her belly. So why not give that load of hot, sticky cum a neighbor in the form of a second load right in her womb? The thought of him filling her to the brim with his seed turns Sonic on more than she can care to admit, and to her immense gratification, before she knows it, that thought becomes reality.

He groans as he cums inside of her a second time, this load ending up splattering the insides of her womb. It feels great... but also, like it's not enough. Realizing she's not done yet, realizing she needs MORE, Sonic doesn't slow down. She keeps going, and to his credit, her 'savior' doesn't complain for even a second. No, rather... he lies back and enjoys the moment for what it is, as Sonic fucks him so hard and so fast that he doesn't even get a chance to go soft inside of her clenching, sopping wet pussy.

In a short time period, though it's still over an hour of incredibly fast-paced fucking, Sonic drains the guy for all he's worth. She'd thought she'd drained his balls on that first load, but in truth, he had plenty left in the tank. Enough to deposit several thick loads of hot, sticky seed inside of her thirsty, genderbent cunt.

By the time he's finally fully done, unable to so much as muster up more than a wheeze as he lays back and stares at the sky with wide eyes, Sonic has lost track of how many times each of them has cum. Pulling off of him, she stretches her arms over her head and yawns a very satisfying yawn... before finally, the cock haze for lack of a better word, lifts from Sonic's mind and she realizes what she's just done...

She... she's a girl now! She wasn't a girl before! And sure, she's fine with being a girl... more than fine with it, after what she just experienced, but still! She needs to... she needs to get to Tails! She needs to figure out a way to fix this, right?!

Sonic is just about to race off to do exactly that, when she realizes she can't just leave the guy she drained of semen laying there without a goodbye. She fully intends to just thank him one more time, but when she catches his eyes, it's like her body has a mind of its own. Beaming happily at him, Sonic sways her hips back and forth, wiggling them and giving him a sultry grin as her eyes become lidded and she bats her new, feminine lashes in his direction.

"Thanks for the fun... bye for now~"

Her sultry tone full of promise, and her eyes all but fucking him again already, Sonic gives a small finger wave before leaving just as quickly as she came. Moving as fast as she possibly can, the hedgehog races for Tails. He would know what to do about all of this... probably.

-x-X-x-

In the end, it turned out that Tails did not in fact know what to do about it. Her fox friend couldn't figure out a way to reverse what happened, and when he'd sent her looking for what they'd deemed the 'Femerald' in order to study it and reverse-engineer a cure, Sonic couldn't find it. It was like the bright pink gem had exploded in the process of transforming her into a woman, and completely vanished without a trace afterwards.

Not that it mattered, ultimately. Sure, Sonic was stuck as a female, but she still kicked Eggman's ass on the regular. She just did it in cute clothes that covered her new girly bits and were specially designed by Tails to be able to handle her high speeds.

She'd also ended up hooking up with that guy she'd fucked in the middle of the Green Hill Zone. Because, when she'd gone back to look for the Femerald, she might not have found it, but she DID run into him again... and one ting had led to another, as Sonic had discovered she needed a way to satisfy her nonstop, constant lust.

In the end, all's well that ended well for the blue-furred hedgehog. She might be a girl now... but really, nothing had changed.

-x-X-x-

Looking for something Original from me to read? Check out !

-x-X-x-

If you'd like to read more of my work not seen on this website, check out and where I have over a thousand stories!

If you'd like to contribute to funding my writing at all, check me out on

Thanks for reading!